---
_id: '63091'
abstract:
- lang: eng
  text: We present the design and characterization of a guided-wave, bright, and highly
    frequency non-degenerate parametric down-conversion (PDC) source in thin-film
    lithium niobate. The source generates photon pairs with wavelengths of 815 nm
    and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths.
    We confirm the high quality of the generated single photons by determining a value
    for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3).
    Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which
    is two orders of magnitude higher than sources based on weakly guiding waveguides.
    The shape of the PDC spectrum and the strong agreement between the effective and
    nominal bandwidth highlight our high fabrication quality of periodically poled
    waveguides. The good agreement between the measured and simulated spectral characteristics
    of our source demonstrates our excellent understanding of the PDC process. Our
    result is a valuable step towards practical and scalable quantum communication
    networks as well as photonic quantum computing.
article_number: '52729'
article_type: original
author:
- first_name: Silia
  full_name: Babel, Silia
  id: '63231'
  last_name: Babel
  orcid: https://orcid.org/0000-0002-1568-2580
- first_name: Laura
  full_name: Bollmers, Laura
  id: '61375'
  last_name: Bollmers
- first_name: Franz
  full_name: Roeder, Franz
  id: '88149'
  last_name: Roeder
- first_name: Werner
  full_name: Ridder, Werner
  id: '63574'
  last_name: Ridder
- first_name: Christian
  full_name: Golla, Christian
  id: '40420'
  last_name: Golla
- first_name: Ronja
  full_name: Köthemann, Ronja
  last_name: Köthemann
- first_name: Bernhard
  full_name: Reineke, Bernhard
  id: '29821'
  last_name: Reineke
- first_name: Harald
  full_name: Herrmann, Harald
  id: '216'
  last_name: Herrmann
- first_name: Benjamin
  full_name: Brecht, Benjamin
  id: '27150'
  last_name: Brecht
  orcid: '0000-0003-4140-0556 '
- first_name: Christof
  full_name: Eigner, Christof
  id: '13244'
  last_name: Eigner
  orcid: https://orcid.org/0000-0002-5693-3083
- first_name: Laura
  full_name: Padberg, Laura
  id: '40300'
  last_name: Padberg
- first_name: Christine
  full_name: Silberhorn, Christine
  id: '26263'
  last_name: Silberhorn
citation:
  ama: Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source
    based on thin-film lithium niobate for bridging visible and telecom wavelengths.
    <i>Optics Express</i>. 2025;33(25). doi:<a href="https://doi.org/10.1364/oe.571605">10.1364/oe.571605</a>
  apa: Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R.,
    Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., &#38; Silberhorn,
    C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium
    niobate for bridging visible and telecom wavelengths. <i>Optics Express</i>, <i>33</i>(25),
    Article 52729. <a href="https://doi.org/10.1364/oe.571605">https://doi.org/10.1364/oe.571605</a>
  bibtex: '@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et
    al._2025, title={Ultrabright, two-color photon pair source based on thin-film
    lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={<a
    href="https://doi.org/10.1364/oe.571605">10.1364/oe.571605</a>}, number={2552729},
    journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel,
    Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian
    and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin
    and Eigner, Christof and et al.}, year={2025} }'
  chicago: Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla,
    Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair
    Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.”
    <i>Optics Express</i> 33, no. 25 (2025). <a href="https://doi.org/10.1364/oe.571605">https://doi.org/10.1364/oe.571605</a>.
  ieee: 'S. Babel <i>et al.</i>, “Ultrabright, two-color photon pair source based
    on thin-film lithium niobate for bridging visible and telecom wavelengths,” <i>Optics
    Express</i>, vol. 33, no. 25, Art. no. 52729, 2025, doi: <a href="https://doi.org/10.1364/oe.571605">10.1364/oe.571605</a>.'
  mla: Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film
    Lithium Niobate for Bridging Visible and Telecom Wavelengths.” <i>Optics Express</i>,
    vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:<a href="https://doi.org/10.1364/oe.571605">10.1364/oe.571605</a>.
  short: S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke,
    H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33
    (2025).
date_created: 2025-12-15T07:20:36Z
date_updated: 2026-01-07T11:28:35Z
department:
- _id: '288'
- _id: '623'
doi: 10.1364/oe.571605
intvolume: '        33'
issue: '25'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729
oa: '1'
publication: Optics Express
publication_identifier:
  issn:
  - 1094-4087
publication_status: published
publisher: Optica Publishing Group
status: public
title: Ultrabright, two-color photon pair source based on thin-film lithium niobate
  for bridging visible and telecom wavelengths
type: journal_article
user_id: '63231'
volume: 33
year: '2025'
...